Custom made cradle would be awesome. If you've ever experienced the difference between a custom high end trailer that's built for the boat and resembles a cradle, versus a trailer with bunk style support (couple 4x12's) it's night and day....

Not a 311-specific setup, but below is what I had to do for my 271. In short; inside. But the trick was I had to clear the small "step winglets/chine" mid-hull-length. So the bunks are about 3" wider on the rear so they support just outside the "pad" but close in to clear the mid-hull step "winglets/chine" on the inside. I can go outside and take more specific pictures and post if you'd like more detail.

https://cimg9.ibsrv.net/gimg/www.off...4ce1cdf8fe.jpg
https://cimg3.ibsrv.net/gimg/www.off...549d01e518.jpg
https://cimg3.ibsrv.net/gimg/www.off...8f17650d11.jpg

^^^ Mine looks about the same. I believe that aligning my guideposts more accurately will give me the precision I need (~2" of play +/-) to be consistently lined up.

Yes, I have my guideposts really tight. Holds the boat in-place even with slight current/wind and she always comes up properly aligned.

Where did you source the rubber and what material did you use for the raised section?

Rubber was already on the bunks. There was enough extra length on the ends to make up for the added longitudinal surface area. The portion "wrapped" down the sides of the wood step, is the material that goes into the bunk channel/grove on the sides of the bunk. I just pulled the "lips" out "open" and slid the rubber top over the built step. I have seen this and similar rubber configurations at online boatlift parts and accessories wholesale sites. I can send you some links if you'd like.

I used treated wood (4 x 1 1/4" I think) from a regular box store which worked well for her 1.53" step once one adds the rubber thickness. It is held in-place with self-tapping wood-to-metal screws overtightened/inserted 1/4-1/2" into the wood to keep the heads away from the hull, and placed in a zig-zag pattern down the length. I do not own this property so I was not eager to go higher-end using Trex, Sliders or a welded step.

Mine are in the same position as yours currently are at the red location. Most boats on my dock are the same also.

Support
 

I would go l and f

Boat Lift
 

This is something I just went through buying a new Poly Lift for my Baja with a 24 degree dead rise.
I would say that I prefer it to be outside the strake (red position) and that’s what I went with my Poly Lift. But honestly, being in the blue position (narrower) would work fine as well. It is just much harder to get seated on when it’s a holiday weekend or in the summer for that matter, since mine is at LOTO.

I would HANDS DOWN, recommend you go with a Poly lift and they will give you any option with bunk positioning you prefer. With everything said, wide is much easier to work with and less stress overall.

HOPE this helps!


https://cimg2.ibsrv.net/gimg/www.off...4daaf6a688.png
https://cimg5.ibsrv.net/gimg/www.off...61e10901f7.png

Ummmmm, HELLOOOOOO
 

The most appropriate place for the bunks on your lift is directly below the STRINGERS that are inside of the hull. My guess is that your center stringers are approximately 24 inches apart, that will be where you want to lift and support your boat from.
Good Luck long term if you support your boat anywhere else.